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Part II:
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These aren t the only considerations you ll have to take into account when migrating, but they are a good starting point
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The basis of any network is the concept of communication The competitive advantage an information technology network gives to an organization is one that no one can afford to be without today Despite its detractors, the Transmission Control Protocol/Internet Protocol (TCP/IP) protocol has become the de facto standard for all network communications And with the advent of version 6 of this protocol, it will become even more entrenched than ever before The principle behind TCP/IP is simple: Each network component is given a specific identifier In version 4 (IPv4), this identifier is in the format of a 32-bit number: four sections of eight binary values each This addressing scheme generates a total of more than four billion IP addresses Given the number of addresses, you would think that IPv4 could serve the Internet requirements of the entire world, but this is not the case This is due to the very structure of IPv4 addressing Since every address is subdivided into a class, and organizations are given the opportunity to acquire classes for private use, even if they don t actually require all of the addresses within this class, the potential four billion addresses have been appropriated quickly and now turn out to be insufficient Because of this, the networking world has had to come up with innovative ways to use IPv4 to fulfill the networking needs and requirements of a wired world One of these solutions is the use of network address translation (NAT) NAT is a great tool, since it allows an organization to use an internal address scheme that is different from the external address scheme it exposes to the outside world Three address ranges have been reserved for internal use: Class A 10000 to 10255255255 (Mask 255000) Class B 1721600 to 17231255255 (Mask 25525500) Class C 19216800 to 192168255255 (Mask 2552552550) Organizations choose the class that best fits their needs based on the number of hosts that are required inside the internal network Class A supports over 16 million hosts per subnet, class B over 65,000, and class C only 254 When communicating on the Internet, NAT translates the internal address to an external address, one that is often provided by an Internet service provider (ISP) NAT uses TCP ports, polling from the 65,000 potential ports when more than one internal address needs translation, greatly multiplying the number of addresses organizations can use, even with the limitations of IPv4 In addition, IPv4 cannot automatically assign host addresses without external help If your internal network includes several thousand hosts, you ll definitely want to take advantage of automatic addressing mechanisms In IPv4, this is done through the Dynamic Host Configuration Protocol (DHCP) Even though all of the hosts on your network have a specific address, using this 32-bit number to communicate between hosts is not practical for human beings Thus, we need to resolve these numbers to names names we can more easily remember The domain naming system (DNS) is the process we use to resolve an Internet address to a more manageable name But if you use legacy technologies within your Windows network, you ll also require
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3:
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legacy name resolution This is performed through the Windows Internet Naming System (WINS) With the advent of Windows Vista and WS08, there is little need for WINS In fact, one of the new features WS08 offers for IPv4 is the possibility to use DNS to reproduce the type of service WINS offers This is done through the inclusion of a new GlobalNames zone, which contains static, global records with single-label names, such as those provided through WINS Organizations moving to WS08 should look to the use of this new zone type and remove WINS servers from their networks Despite these temporary solutions, IPv4 use is becoming increasing more difficult, especially in terms of routing Internet routers using version 4 of TCP/IP are having more and more trouble storing routing tables, the path a host must use to reach a given destination A permanent solution is needed if the entire world is to have access to the Internet, especially emerging nations The Internet Engineering Task Force (IETF) has been working for some time on a complete solution to the IPv4 situation The solution is embedded into version 6 of the TCP/IP protocol: IPv6 Version 6 uses a 128-bit addressing scheme This results in 340, 282, 366, 920, 938, 463, 463, 374, 607, 431, 768, 211, 456 unique entities on the Internet, quite enough for the time being IPv6 can support true point-to-point communications between hosts and destinations without the use of schemes such as address translation In addition, IPv6 includes numerous other improvements For example, an IPv6 host does not necessarily require DHCP, since it can generate its own address from the unique number assigned to its network interface card, the media access control (MAC) number If the host needs to communicate externally, its IPv6 address will be generated from both the MAC address and the address of the router it is connected to, greatly simplifying both addressing and communications, since the router address becomes part of the host s address WS08 includes full support for IPv6 In fact, IPv6 is installed and enabled by default Each host has its own automatic IPv6 address along with its IPv4 address WS08 uses a technology called Teredo to map IPV4 to IPV6 addresses and vice versa Though all WS08 and Vista systems will be able to use IPv6 automatically, there are still issues with using it For example, routers need to support IPv6 for the protocol to work Most router manufacturers have implemented software solutions for IPv6 support for existing routers, and new routers include this support by default Cisco systems and others have downloadable software revisions for their operating systems, which include IPv6 support New router products have hardware solutions for IPv6 support But router support is not the only requirement Applications that are based on IPv4 today will not automatically function
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